Quiz

QUIZ

1. What is the number of valence electrons around the carbon atom?

a. One b. Two c. Three d. Four

Answer: d. There are four valence electrons around the carbon atom. Rather than taking on electrons entirely, which would make for a crowded state of repulsing electrons, the carbon atom will share these four valence electrons with another atom so that there can be a balance between the shared electron and the positively-charged atom it shares the electrons with.

2. What is the number of valence electrons around the hydrogen atom?

a. One b. Two c. Three d. Four

Answer: a. Hydrogen has a single electron with only one available for bonding; this means that it has one valence electron in total.

3. Sending an electron to a higher orbital from a lower orbital in order to have an electron able to bind with another atom is called what?

a. Elevation b. Hybridization c. Promotion d. Energization

Answer: c. Promotion involves sending an electron to a higher orbital from a lower orbital in order to have a free electron available to bind with another atom.

4. Creating a new orbital out of two other orbitals in order to have a stable orbital for bonding is called what?

a. Elevation b. Hybridization c. Promotion d. Energization

Answer: b. Hybridization involves making a new orbital out of two other orbital types in order to have an orbital available for bonding. This takes energy but it is made up for by the energy “saved” in the bonding.

5. Which of the following carbon-based molecules has a triple bond of carbon to carbon?

a. Methane b. Ethane c. Ethylene d. Acetylene

Answer: d. Acetylene is C2H2 with a triple bond between the two carbon atoms.

6. When methanol becomes charged, where is the formal charge located?

a. Oxygen atom b. Hydrogen atom c. Carbon atom d. CH3 side chain

Answer: a. When methanol becomes charged, the formal charge of the molecule is located on the oxygen atom rather than on any other part of the molecule.

7. What is the charge on a hydronium atom?

a. Negative 2 b. Positive 1 c. Positive 2 d. Negative 2

Answer: b. The charge on the hydronium atom or “hydronium ion” is a positive one charge. Hydroxide, on the other hand, is a negative one charge.

8. What situation with nitrogen bonding in organic molecular situations does not exist?

a. A triple bond with another molecule b. A double bond and a single bond with two other molecules c. Four single bonds with four other molecules d. Two double bonds with two other molecules

Answer: d. The situation of two double bonds with two other molecules with nitrogen just doesn’t exist in nature.

9. In doing line structures, hydrogen is not listed as a separate atom if it is attached to what other atom?

a. Hydrogen b. Carbon c. Oxygen d. Nitrogen

10. Answer: b. Hydrogen attached to carbon does not have either atom listed separately; however, the hydrogen atom will be listed if it has attached to any other atom.

a. What is considered a structural isomer of C6H12O6? b. Deoxyribose c. Ribose d. Fructose e. Lactose

Answer: c. Both glucose and fructose are structural isomers that can be written a C6H12O6 but are different structural isomers.